Egress Window Cost 2026: What a Code-Compliant Basement Window Really Costs

2026-08-20 — Ottawa-Gatineau

A legal basement bedroom needs a code-compliant egress window — no way around it, it's the Building Code. Short answer: cutting or enlarging the opening runs $1,200 to $2,500, and the full project (window, well, drain) typically lands between $2,500 and $6,000 in Ottawa-Gatineau. Here's the breakdown, line by line.

2026 price grid

• Cutting a new opening in the foundation: $1,500 – $2,500
• Enlarging an existing opening: $1,200 – $2,000
• Egress window (slider or casement, rated): $500 – $1,200
• Window well (galvanized or moulded): $300 – $800
• Well drain tied into the weeping tile: $400 – $900
• Exterior excavation: $300 – $800 depending on access

Typical total project: $2,500 to $6,000, all in. A straightforward cut in a standard 8-inch poured foundation with easy access sits at the low end; a major enlargement with deep excavation and drainage sits at the high end. The concrete cut itself only takes a few hours — everything around it explains the price gap.

The concrete cut itself only takes a few hours — everything around it explains the price gap.

Quotes are normally broken into two contracts: the concrete cutting (us) and the window/well/drain installation (a window installer or landscaper). Keeping them separate lets you shop each trade. One common surprise: the basement windows in most Ottawa homes built before the 1980s are far too small — enlarging the opening is the rule, not the exception.

Code dimensions at a glance (OBC / NBC)

To qualify as an emergency escape, the window must provide:

• An unobstructed open area of at least 0.35 m² (3.8 sq ft);
• No dimension less than 380 mm (15 in);
• A window well with at least 550 mm (22 in) of clearance in front of the window;
• Operation from the inside with no tools or keys.

Full details in our guide: enlarging a basement window to meet egress code. If your current opening is too small, cutting is exactly what you need.

What drives the price up

• Foundation type and thickness. An 8-inch poured concrete wall cuts cleanly. 1950s block or downtown Ottawa stone foundations are a different story.
• Excavation depth. The deeper the basement, the deeper the hole — and the deeper the well drain has to go to reach the weeping tile.
• Buried services. Gas, hydro, cable: everything gets located before digging. A line that needs moving adds to the project.
• Interior finishing. Framing, drywall, trim: turnkey costs more than cut-only.
• Machine access. A fenced backyard with no mini-excavator access gets dug by hand — literally.

In pictures

Why it pays for itself

A compliant egress window turns "storage space" into a legal bedroom. In Ottawa, one more bedroom often adds $15,000 to $30,000 in resale value — never mind the option of housing a teenager, a parent or a tenant. For a basement apartment, it's flat-out mandatory: without a compliant escape, the unit isn't legal, and your insurer can deny a claim.

How to pay less

your insurer can deny a claim. Appraisers can't count a basement room without egress as a bedroom, no matter how nice the reno looks.

How to pay less

• Do the cut and the excavation in the same visit. One mobilization, one cleanup.
• Install two windows at once if you're planning two bedrooms — the second cut costs far less than the first.
• Pick a slider over a casement when dimensions allow: often cheaper at the same compliant size.
• Prep the interior yourself (remove drywall, insulation, framing) before we arrive.
• Check the weeping tile first. If it's working, the well drain hookup is simple; if it's done, better to know before digging.

Check the weeping tile first. If it's working, the well drain hookup is simple; if it's done, better to know before digging.

Reuse the excavated soil on-site for grading if it's clean — disposal fees add up fast on deep digs.

We cut window openings in foundations every week, from Ottawa to Gatineau. See our window & door openings service → — free quote within 24 hours.